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PXI-4070 DMM's separate plug for voltage and current measurement

My questions on this subject:
May I connect both connectors at the same time? E.g: when I do a voltage measurement or no measurement at all, will not current input (AMPS IN) and Common (LO) be shorted (with an internal low-ohmic shunt)? I measure infinite resistance between LO and AMPS IN, so I assume there is an internal relay disconnecting the AMPS_IN plug when idle. What happens to this relay when I immediately switch between voltage and current measurement mode? Is there a never-exceed voltage on AMPS_IN?
Thanks,  Tommy

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